Preheat your oven to 420°F (215°C) in natural convection/static heat mode.
In a mixing bowl, whisk together all-purpose flour, milk, baking powder, garlic powder, paprika, onion powder, salt, and black pepper until you achieve a smooth consistency.
Cut your cauliflower into bite-sized florets and dip each floret into your prepared batter until fully coated.
After dipping in batter, coat each floret with Panko breadcrumbs.
Line a baking tray with parchment paper and arrange your breaded florets in a single layer before drizzling them lightly with olive oil.
Bake in your preheated oven for 20 to 25 minutes or until golden brown and crispy.
Mix mayonnaise, Thai sweet chili sauce, Sriracha sauce, and rice vinegar in a small bowl; adjust seasoning as needed before tossing cooked cauliflower florets in this sauce.